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/*
* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.AWTEventMulticaster;
/*
* @test
* @bug 8342782
* @summary Tests large AWTEventMulticasters for StackOverflowErrors
* @run main LargeAWTEventMulticasterTest
*/
public class LargeAWTEventMulticasterTest {
/**
* This is an empty ActionListener that also has a numeric index.
*/
static class IndexedActionListener implements ActionListener {
private final int index;
public IndexedActionListener(int index) {
this.index = index;
}
@Override
public void actionPerformed(ActionEvent e) {
}
public int getIndex() {
return index;
}
@Override
public String toString() {
return Integer.toString(index);
}
}
public static void main(String[] args) {
int maxA = 0;
try {
for (int a = 1; a < 200_000; a *= 2) {
maxA = a;
testAddingActionListener(a);
}
} finally {
System.out.println("maximum a = " + maxA);
}
}
private static void testAddingActionListener(int numberOfListeners) {
// step 1: create the large AWTEventMulticaster
ActionListener l = null;
for (int a = 0; a < numberOfListeners; a++) {
l = AWTEventMulticaster.add(l, new IndexedActionListener(a));
}
// Prior to 8342782 we could CREATE a large AWTEventMulticaster, but we couldn't
// always interact with it.
// step 2: dispatch an event
// Here we're making sure we don't get a StackOverflowError when we traverse the tree:
l.actionPerformed(null);
// step 3: make sure getListeners() returns elements in the correct order
// The resolution for 8342782 introduced a `rebalance` method; we want to
// double-check that the rebalanced tree preserves the appropriate order.
IndexedActionListener[] array = AWTEventMulticaster.getListeners(l, IndexedActionListener.class);
for (int b = 0; b < array.length; b++) {
if (b != array[b].getIndex())
throw new Error("the listeners are in the wrong order. " + b + " != " + array[b].getIndex());
}
}
}
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